LIST OP PUBLICATIONS. 



145 



Hay, Oliver P. On the nature of Edes- 

 tus and related genera, with descrip- 

 tions of one new genus and three new 



species. 



Ptoc. U. S. Nat. Mus., 37, No. 

 1699, Oct. 16, 1909, pp. 43-61' 

 pis. 12-15, figs. 1-7. 

 In this paper there are described three 

 new species of EdestUK, E. crennlatun, E. 

 serratus, and E. minusculus. The last 

 name is applied to a species found in 

 Russia. A description, with figures, is 

 given of the histology of Edestus. Addi 

 tional specimens of JAssopnon ferrkri are 

 described and figured, which show that 

 the so-called teeth of this genus were 

 coiled, as in Helicoprion. A new genus, 

 Toxoprion, is founded, the type of which 

 is Dean's Edestus lecontei. The genera 

 here mentioned are all defined. The last 

 section of the paper is devoted to a dis- 

 cussion of the nature of the objects on 

 which the genera mentioned are based. 

 Reasons are presented why they can 

 hardly be regarded as teeth. It is be- 

 lieved by the writer that these objects, 

 straight, bent, or coiled, were more proba- 

 bly organs of defense or attack, arranged 

 along the back near the dorsal fins. 



On the manner of locomotion of 



the dinosaurs, especially Diplodocus, 

 with remarks on the origin of the birds. 

 Proc. Washington Acad. Sci., 12, 

 No. 1, Feb. 15, 1910, pp. 1-25, 

 1 pi., figs. 1-7. 

 The position taken by the author of 

 this paper is that the sauropodous dino- 

 saurs, especially Diplodocus, did noi walk 

 In a mammal-like way, as usually repre- 

 sented, but more as the crocodiles 

 walk. In reply to Abel's argument that 

 Diplodocus walked as usually represented 

 because its feet were digitigrade. Hay 

 points out that the land tortoise is digiti. 

 grade. Before the close of the Jurassic 

 there were dinosaurs that went erect on 

 their hind legs, l)Ut it is not necessary to 

 suppose that their ancestors walked as 

 mammals do. The origin of bipedalisrn 

 Is considered, illustrations thereof being 

 drawn from certain lizards. Certain 

 crocodiles attain great size, but this does 

 not necessitate an erect gait. The entax- 

 onic structure of the feet shows that Dip- 

 lodocus did not walk erect but rather as 

 crocodiles walk. 



The author takes the position that the 

 whole pro.ximal end of the femur, rounded 

 out by cartilage, fonned the end of that 

 bone and was inserted into the acetabu- 

 Itun, as in the crocodiles and the lizards. 

 The thigh thus moved backward and for- 

 ward in an approximately horizontal 

 plane. Issue is taken with von Huene as 

 regards the pose of some of the Triassic 

 dinosaurs, the position of some of these 



71245°— NAT MUS 1910 10 



Hay, Oliver P. — rontinucd. 



being regarded as too mammal-like. The 

 writer holds further that the bipedal dino- 

 saurs had a more straddling gait than is 

 usually supposed. It is held as not 

 proved that the hirdlike tracks found in 

 the Connecticut X'alley were not made by 

 primitive dinosaur-like birds. The sauro- 

 pods are regarded as the most primitive, 

 and that from these sprang first the birds 

 and later other groups of dinosaurs. The 

 birds became bipedal because of speciali- 

 zation of their wings for Height; dinosaurs, 

 because of the reduction of their fore 

 limbs. Finally, bipedalisrn has no neces- 

 sary connection with tridactylism. 



Specimens in the collections of the 

 U. S. National Museum were used for 

 study in the preparation of this article. 



Descriptions of eight new species 



of fossil turtles from west of the hun- 

 dredth meridian. 



Proc. U. S. Nat. .\fus., .38, No. 

 1747, June 29, 1910, pp. 307-52(1, 

 pis. 10-12, figs. 1-23. 



Two species of Compsemys, C. va/er, 

 from Puerco or Torrejon deposits, in New 

 Mexico, and C. parva, from the same re- 

 gion and probably the same deposits, are 

 here described. These new materials 

 throw new light on the characters of the 

 genus. Mesoplastra were certainly pres- 

 ent and the genus is to be placed in the 

 Baenidae. 



Two species of the remarkable genus 

 Basilemys are described, B. prxclara, from 

 the Lance Creek beds of South Dakota, 

 and B. nobilis, from beds of probably ilie 

 same age in New Mexico. 



Adocus vigoratus comes from the Creta- 

 ceous of New Mexico, t he same beds which 

 furnished B. nobilis. Alamosemys an- 

 nem, not distant from tlie preceding 

 species, was found in what probably are 

 Torrejon deposits in Colorado. Hop- 

 lochclys bicarinata, from the Puerco or 

 Torrejon of New Mexico, is represented by 

 large parts of both carapace and plastron. 

 A spideretes amnigenus is a new trionyehid 

 from the I.-.ince Creek beds of South 

 Dakota, and is represented by a nearly 

 complete costal plate. 



Knowlton, Frank H. Descriptions of 

 fossil plants from the Mesozoic and 

 Cenozoic of North America. I. (1) 

 Two fossil chain ferns (Woodwardia) 

 from Oregon and Wyoming. (2) A new 

 name for Davallia tenuifolia Swartz, aa 

 identified by Dawson, and Asplenium 

 tenerum Lesquereux. , 



Smithsonian ^risc. Colls., 52, 



Quar. issue, 

 Jan. 11, 1910, 

 63, 64. 



Pt. 

 pp. 



4, No. 1S84, 

 4S9-906, pis. 



